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perf trace: Return error if a system call doesn't exist

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When a system call is not detected, the reason is either because the
system call ID is out of scope or failure to find the corresponding path
in the sysfs, trace__read_syscall_info() returns zero.  Finally, without
returning an error value it introduces confusion for the caller.

This patch lets the function trace__read_syscall_info() to return
-EEXIST when a system call doesn't exist.

Fixes: b8b1033fca ("perf trace: Mark syscall ids that are not allocated to avoid unnecessary error messages")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: bpf@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221121075237.127706-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2022-11-21 07:52:34 +00:00 committed by Arnaldo Carvalho de Melo
parent eadcab4c7a
commit d4223e1776
1 changed files with 2 additions and 2 deletions
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4
tools/perf/builtin-trace.c
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@ -1796,11 +1796,11 @@ static int trace__read_syscall_info(struct trace *trace, int id)
#endif
sc = trace->syscalls.table + id;
if (sc->nonexistent)
return 0;
return -EEXIST;
if (name == NULL) {
sc->nonexistent = true;
return 0;
return -EEXIST;
}
sc->name = name;